Add cmpxchg_local to sparc64

[linux-2.6-omap-h63xx.git] / include / asm-sparc64 / system.h

diff --git a/include/asm-sparc64/system.h b/include/asm-sparc64/system.h
index 159e62b51d705055b7b975ab4a4f68f21c6e429a..1faefa6d3708c789c757b5e2b2e9e32fa4ae43d1 100644 (file)
--- a/include/asm-sparc64/system.h
+++ b/include/asm-sparc64/system.h
@@ -8,6 +8,7 @@
 #ifndef __ASSEMBLY__
 
 #include <linux/irqflags.h>
+#include <asm-generic/cmpxchg-local.h>
 
 /*
  * Sparc (general) CPU types
@@ -178,7 +179,9 @@ do {        if (test_thread_flag(TIF_PERFCTR)) {                            \
        "ldx    [%%g6 + %9], %%g4\n\t"                                  \
        "brz,pt %%o7, 1f\n\t"                                           \
        " mov   %%g7, %0\n\t"                                           \
-       "b,a ret_from_syscall\n\t"                                      \
+       "sethi  %%hi(ret_from_syscall), %%g1\n\t"                       \
+       "jmpl   %%g1 + %%lo(ret_from_syscall), %%g0\n\t"                \
+       " nop\n\t"                                                      \
        "1:\n\t"                                                        \
        : "=&r" (last), "=r" (current), "=r" (current_thread_info_reg), \
          "=r" (__local_per_cpu_offset)                                 \
@@ -313,6 +316,34 @@ __cmpxchg(volatile void *ptr, unsigned long old, unsigned long new, int size)
                                    (unsigned long)_n_, sizeof(*(ptr))); \
   })
 
+/*
+ * cmpxchg_local and cmpxchg64_local are atomic wrt current CPU. Always make
+ * them available.
+ */
+
+static inline unsigned long __cmpxchg_local(volatile void *ptr,
+                                     unsigned long old,
+                                     unsigned long new, int size)
+{
+       switch (size) {
+       case 4:
+       case 8: return __cmpxchg(ptr, old, new, size);
+       default:
+               return __cmpxchg_local_generic(ptr, old, new, size);
+       }
+
+       return old;
+}
+
+#define cmpxchg_local(ptr, o, n)                                       \
+       ((__typeof__(*(ptr)))__cmpxchg_local((ptr), (unsigned long)(o), \
+                       (unsigned long)(n), sizeof(*(ptr))))
+#define cmpxchg64_local(ptr, o, n)                                     \
+  ({                                                                   \
+       BUILD_BUG_ON(sizeof(*(ptr)) != 8);                              \
+       cmpxchg_local((ptr), (o), (n));                                 \
+  })
+
 #endif /* !(__ASSEMBLY__) */
 
 #define arch_align_stack(x) (x)